/* * ALSA Driver for the PT2258 volume controller. * * Copyright (c) 2006 Jochen Voss * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include #include #include #include #include MODULE_AUTHOR("Jochen Voss "); MODULE_DESCRIPTION("PT2258 volume controller (Princeton Technology Corp.)"); MODULE_LICENSE("GPL"); #define PT2258_CMD_RESET 0xc0 #define PT2258_CMD_UNMUTE 0xf8 #define PT2258_CMD_MUTE 0xf9 static const unsigned char pt2258_channel_code[12] = { 0x80, 0x90, /* channel 1: -10dB, -1dB */ 0x40, 0x50, /* channel 2: -10dB, -1dB */ 0x00, 0x10, /* channel 3: -10dB, -1dB */ 0x20, 0x30, /* channel 4: -10dB, -1dB */ 0x60, 0x70, /* channel 5: -10dB, -1dB */ 0xa0, 0xb0 /* channel 6: -10dB, -1dB */ }; int snd_pt2258_reset(struct snd_pt2258 *pt) { unsigned char bytes[2]; int i; /* reset chip */ bytes[0] = PT2258_CMD_RESET; snd_i2c_lock(pt->i2c_bus); if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1) goto __error; snd_i2c_unlock(pt->i2c_bus); /* mute all channels */ pt->mute = 1; bytes[0] = PT2258_CMD_MUTE; snd_i2c_lock(pt->i2c_bus); if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1) goto __error; snd_i2c_unlock(pt->i2c_bus); /* set all channels to 0dB */ for (i = 0; i < 6; ++i) pt->volume[i] = 0; bytes[0] = 0xd0; bytes[1] = 0xe0; snd_i2c_lock(pt->i2c_bus); if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2) goto __error; snd_i2c_unlock(pt->i2c_bus); return 0; __error: snd_i2c_unlock(pt->i2c_bus); snd_printk(KERN_ERR "PT2258 reset failed\n"); return -EIO; } static int pt2258_stereo_volume_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->count = 2; uinfo->value.integer.min = 0; uinfo->value.integer.max = 79; return 0; } static int pt2258_stereo_volume_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_pt2258 *pt = kcontrol->private_data; int base = kcontrol->private_value; /* chip does not support register reads */ ucontrol->value.integer.value[0] = 79 - pt->volume[base]; ucontrol->value.integer.value[1] = 79 - pt->volume[base + 1]; return 0; } static int pt2258_stereo_volume_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_pt2258 *pt = kcontrol->private_data; int base = kcontrol->private_value; unsigned char bytes[2]; int val0, val1; val0 = 79 - ucontrol->value.integer.value[0]; val1 = 79 - ucontrol->value.integer.value[1]; if (val0 < 0 || val0 > 79 || val1 < 0 || val1 > 79) return -EINVAL; if (val0 == pt->volume[base] && val1 == pt->volume[base + 1]) return 0; pt->volume[base] = val0; bytes[0] = pt2258_channel_code[2 * base] | (val0 / 10); bytes[1] = pt2258_channel_code[2 * base + 1] | (val0 % 10); snd_i2c_lock(pt->i2c_bus); if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2) goto __error; snd_i2c_unlock(pt->i2c_bus); pt->volume[base + 1] = val1; bytes[0] = pt2258_channel_code[2 * base + 2] | (val1 / 10); bytes[1] = pt2258_channel_code[2 * base + 3] | (val1 % 10); snd_i2c_lock(pt->i2c_bus); if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2) goto __error; snd_i2c_unlock(pt->i2c_bus); return 1; __error: snd_i2c_unlock(pt->i2c_bus); snd_printk(KERN_ERR "PT2258 access failed\n"); return -EIO; } #define pt2258_switch_info snd_ctl_boolean_mono_info static int pt2258_switch_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_pt2258 *pt = kcontrol->private_data; ucontrol->value.integer.value[0] = !pt->mute; return 0; } static int pt2258_switch_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_pt2258 *pt = kcontrol->private_data; unsigned char bytes[2]; int val; val = !ucontrol->value.integer.value[0]; if (pt->mute == val) return 0; pt->mute = val; bytes[0] = val ? PT2258_CMD_MUTE : PT2258_CMD_UNMUTE; snd_i2c_lock(pt->i2c_bus); if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1) goto __error; snd_i2c_unlock(pt->i2c_bus); return 1; __error: snd_i2c_unlock(pt->i2c_bus); snd_printk(KERN_ERR "PT2258 access failed 2\n"); return -EIO; } static const DECLARE_TLV_DB_SCALE(pt2258_db_scale, -7900, 100, 0); int snd_pt2258_build_controls(struct snd_pt2258 *pt) { struct snd_kcontrol_new knew; char *names[3] = { "Mic Loopback Playback Volume", "Line Loopback Playback Volume", "CD Loopback Playback Volume" }; int i, err; for (i = 0; i < 3; ++i) { memset(&knew, 0, sizeof(knew)); knew.name = names[i]; knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER; knew.count = 1; knew.access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ; knew.private_value = 2 * i; knew.info = pt2258_stereo_volume_info; knew.get = pt2258_stereo_volume_get; knew.put = pt2258_stereo_volume_put; knew.tlv.p = pt2258_db_scale; err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt)); if (err < 0) return err; } memset(&knew, 0, sizeof(knew)); knew.name = "Loopback Switch"; knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER; knew.info = pt2258_switch_info; knew.get = pt2258_switch_get; knew.put = pt2258_switch_put; knew.access = 0; err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt)); if (err < 0) return err; return 0; } EXPORT_SYMBOL(snd_pt2258_reset); EXPORT_SYMBOL(snd_pt2258_build_controls); > (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'sound/soc/sh/ssi.c')